stdlib/FreeBSD/getopt.c

   1 /*      $NetBSD: getopt.c,v 1.26 2003/08/07 16:43:40 agc Exp $  */
   2
   3 /*
   4  * Copyright (c) 1987, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 4. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #if defined(LIBC_SCCS) && !defined(lint)
  33 static char sccsid[] = "@(#)getopt.c    8.3 (Berkeley) 4/27/95";
  34 #endif /* LIBC_SCCS and not lint */
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD: src/lib/libc/stdlib/getopt.c,v 1.8 2007/01/09 00:28:10 imp Exp $");
  37
  38 #include "namespace.h"
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <unistd.h>
  43 #include "un-namespace.h"
  44
  45 #include "libc_private.h"
  46
  47 #ifndef BUILDING_VARIANT
  48 int     opterr = 1,             /* if error message should be printed */
  49         optind = 1,             /* index into parent argv vector */
  50         optopt,                 /* character checked for validity */
  51         optreset;               /* reset getopt */
  52 char    *optarg;                /* argument associated with option */
  53 #endif /* !BUILDING_VARIANT */
  54
  55 #define BADCH   (int)'?'
  56 #define BADARG  (int)':'
  57 #define EMSG    ""
  58
  59 #if __DARWIN_UNIX03
  60 #define PROGNAME nargv[0]
  61 #else
  62 #define PROGNAME _getprogname()
  63 #endif
  64
  65 /*
  66  * getopt --
  67  *      Parse argc/argv argument vector.
  68  */
  69 int
  70 getopt(nargc, nargv, ostr)
  71         int nargc;
  72         char * const nargv[];
  73         const char *ostr;
  74 {
  75         static char *place = EMSG;              /* option letter processing */
  76         char *oli;                              /* option letter list index */
  77
  78         if (optreset || *place == 0) {          /* update scanning pointer */
  79                 optreset = 0;
  80                 place = nargv[optind];
  81                 if (optind >= nargc || *place++ != '-') {
  82                         /* Argument is absent or is not an option */
  83                         place = EMSG;
  84                         return (-1);
  85                 }
  86                 optopt = *place++;
  87                 if (optopt == '-' && *place == 0) {
  88                         /* "--" => end of options */
  89                         ++optind;
  90                         place = EMSG;
  91                         return (-1);
  92                 }
  93                 if (optopt == 0) {
  94                         /* Solitary '-', treat as a '-' option
  95                            if the program (eg su) is looking for it. */
  96                         place = EMSG;
  97                         if (strchr(ostr, '-') == NULL)
  98                                 return (-1);
  99                         optopt = '-';
 100                 }
 101         } else
 102                 optopt = *place++;
 103
 104         /* See if option letter is one the caller wanted... */
 105         if (optopt == ':' || (oli = strchr(ostr, optopt)) == NULL) {
 106                 if (*place == 0)
 107                         ++optind;
 108                 if (opterr && *ostr != ':')
 109                         (void)fprintf(stderr,
 110                             "%s: illegal option -- %c\n",
 111                             PROGNAME, optopt);
 112                 return (BADCH);
 113         }
 114
 115         /* Does this option need an argument? */
 116         if (oli[1] != ':') {
 117                 /* don't need argument */
 118                 optarg = NULL;
 119                 if (*place == 0)
 120                         ++optind;
 121         } else {
 122                 /* Option-argument is either the rest of this argument or the
 123                    entire next argument. */
 124                 if (*place)
 125                         optarg = place;
 126                 else if (nargc > ++optind)
 127                         optarg = nargv[optind];
 128                 else {
 129                         /* option-argument absent */
 130 #if __DARWIN_UNIX03
 131                         /* Yes, the standard will put optind past the last
 132                            argument */
 133                         ++optind;
 134                         optarg = NULL;
 135 #endif /* __DARWIN_UNIX03 */
 136                         place = EMSG;
 137                         if (*ostr == ':')
 138                                 return (BADARG);
 139                         if (opterr)
 140                                 (void)fprintf(stderr,
 141                                     "%s: option requires an argument -- %c\n",
 142                                     PROGNAME, optopt);
 143                         return (BADCH);
 144                 }
 145                 place = EMSG;
 146                 ++optind;
 147         }
 148         return (optopt);                        /* return option letter */
 149 }